﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Globalization;

namespace ProgNetComponents.Design.TypeConverters
{
    /// <summary>
    /// Base type converter for arrays of objects
    /// </summary>
    /// <typeparam name="T">Object type</typeparam>
    public class ArrayTypeConverter<T> : TypeConverter
    {
        /// <summary>
        /// Returns whether this converter can convert an object of the given type to the type of this converter, using the specified context.
        /// </summary>
        /// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context.</param>
        /// <param name="sourceType">A <see cref="T:System.Type" /> that represents the type you want to convert from.</param>
        /// <returns>
        /// true if this converter can perform the conversion; otherwise, false.
        /// </returns>
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (sourceType == typeof(string))
                return true;
            return base.CanConvertFrom(context, sourceType);
        }
        /// <summary>
        /// Converts the given object to the type of this converter, using the specified context and culture information.
        /// </summary>
        /// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context.</param>
        /// <param name="culture">The <see cref="T:System.Globalization.CultureInfo" /> to use as the current culture.</param>
        /// <param name="value">The <see cref="T:System.Object" /> to convert.</param>
        /// <returns>
        /// An <see cref="T:System.Object" /> that represents the converted value.
        /// </returns>
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            if (value is string)
            {
                List<T> l = new List<T>();
                string[] v = ((string)value).Split(new char[] { ';' });
                try
                {
                    foreach (string s in v)
                    {
                        l.Add((T)(Convert.ChangeType(s.Trim(), typeof(T))));
                    }
                    return l.ToArray();
                }
                catch { }
            }
            return base.ConvertFrom(context, culture, value);
        }
        /// <summary>
        /// Converts the given value object to the specified type, using the specified context and culture information.
        /// </summary>
        /// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context.</param>
        /// <param name="culture">A <see cref="T:System.Globalization.CultureInfo" />. If null is passed, the current culture is assumed.</param>
        /// <param name="value">The <see cref="T:System.Object" /> to convert.</param>
        /// <param name="destinationType">The <see cref="T:System.Type" /> to convert the <paramref name="value" /> parameter to.</param>
        /// <returns>
        /// An <see cref="T:System.Object" /> that represents the converted value.
        /// </returns>
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType == typeof(string))
            {
                string str = "";
                if (value is T[])
                {
                    foreach (T i in ((T[])(value)))
                        str += i.AsString() + ";";
                }
                return str.TrimEnd(';');
            }
            return base.ConvertTo(context, culture, value, destinationType);
        }
    }
    /// <summary>
    /// Type converter for array of strings
    /// </summary>
    public class StringArrayTypeConverter : ArrayTypeConverter<string>
    {

    }
}
